A=9/14-2/7x5 B=8/3-5/3:20/21 C=1-(2/3+1/4) D=3-5/2/1+1/5
Mathématiques
esae
Question
A=9/14-2/7x5
B=8/3-5/3:20/21
C=1-(2/3+1/4)
D=3-5/2/1+1/5
B=8/3-5/3:20/21
C=1-(2/3+1/4)
D=3-5/2/1+1/5
2 Réponse
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1. Réponse anno32
Bonjour
A = 9/14 - 2/7 x 5A = 9/14 - 10/7
A = 9/14 - 20/14
A = -11/14
B = 8/3 -5/3 : 20/21
B = 8/3 - 5/3 x 21/20
B = 8/3 - 105/60
B = 160/60 - 105/60
B = 55/60
B = 11/12
C = 1 - (2/3 + 1/4)
C = 1 - (8/12 + 3/12)
C = 1 - 11/12
C = 12/12 - 11/12
C = 1/12
D = (3-5/2) / (1+1/5)
D = (6/2 - 5/2) / (5/5 + 1/5)
D = (1/2) / (6/5)
D = 1/2 x 5/6
D = 5/12
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2. Réponse maudmarine
A = 9/14 - 2/7 x 5
A = 9/14 - 10/7
A = 9/014 - 10 x 2 / 7 x 2
A = 9/14 - 20/14
A = - 11/14
B = 8/3 - 5/3 : 20/21
B = 8/3 - 5/3 x 21/20
B = 8/3 - 105/60
B = 8 x 20 / 3 x 20 - 105/60
B = 160/60 - 105/60
B = 55/60
B = 5 x 11 / 5 x 12
B = 11/12
C = 1 - (2/3 + 1/4)
C = 1 - (2 x 4 / 3 x 4 + 1 x 3 / 4 x 3)
C = 1 - (8/12 + 3/12)
C = 1 - 11/12
C = 1 x 12 / 1 x 12 - 11/12
C = - 1/12
D = (3 - 5/2) / (1 + 1/5)
D = (3 x 2 / 1 x 2 - 5/2) / (1 x 5 / 1 x 5 + 1/5)
D = (6/2 - 5/2) / (5/5 + 1/5)
D = (1/2) / (6/5)
D = 1/2 x 5/6
D = 5/12